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The sooner you get a smoke test the sooner you will discover or uncover the vacuum leak. A smoke test is where the mechanic blows smoke through the vacuum system in order to find the leaking hoses. It could either be something as simple as lower intake boots or as complex as crankcase ventilation hoses. No the problem won't get worse nor cause other parts to malfunction, its just that most folks are in a hurry to get back on the road...